I. ${x^2} - 17x - 84 = 0$

II. ${y^2} + 4y - 117 = 0$

${x^2} - 17x - 84 = 0$

${x^2} + 4x - 21x - 84 = 0$

$left( {x + 4} ight)left( {x - 21} ight) = 0$

$x = - 4,21$

${y^2} + 4y - 117 = 0$

${y^2} - 9y + 13y - 117 = 0$

$left( {y - 9} ight)left( {y + 13} ight) = 0$

$y = 9, - 13$

no relation can be established